'Once Upon a Time' Preview: Regina Makes a Promise to Zelena

Regina (Lana Parrilla) allows a muted Zelena (Rebecca Mader) to speak.

Once Upon a Time Season 5 continues with a new episode ("Siege Perilous") on Sunday, October 11 at 8 p.m. ET/PT on ABC.

In Camelot, the heroes feverishly work to free Merlin. Determined to help Emma, David embarks on a quest to retrieve a magical relic that Regina could use to communicate with the imprisoned sorcerer, but, when David leaves, Arthur insists on joining him because the dangers ahead are greater than he can imagine. Meanwhile, Mary Margaret discovers the fate of her old friend Lancelot. Back in Storybrooke, Arthur seeks David's help to catch a thief who threatens the safety of the citizens of Camelot. Across town, Emma reaches out to a conflicted Hook as she sets about her plan to draw Excalibur from the stone

In the sneak peek below, Regina (Lana Parrilla) allows a muted Zelena (Rebecca Mader) to speak and confronts her sister about taking away Robin's (Sean Maguire) baby.



The Once Upon a Time cast includes Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as the Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Colin O’Donoghue as Hook, Jared S. Gilmore as Henry Mills, Sean Maguire as Robin Hood, Rebecca Mader as the Wicked Witch/Zelena and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest stars in tonight's episode include Lee Arenberg as Leroy/Grumpy, Beverley Elliott as Granny, Liam Garrigan as King Arthur, Joana Metrass as Guinevere, Sinqua Walls as Lancelot, David-Paul Grove as Doc, Gabe Khouth as Sneezy, Faustino Di Bauda as Sleepy, Michael Coleman as Happy, Mig Macario as Bashful, Jeffrey Kaiser as Dopey, and Giacomo Baessato as Grif.